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5-6

Installing Remote Base Controllers—RBCs SIMATIC 545/555/575 System Manual

5.4 PPX:505–6851–A/B and PPX:505–6850–A/B RBCs

The following options for the PPX:505–6851 RBC (–A and –B versions) and

PPX:505–6850 (–A and –B) RBCs are user-selectable:

• The state of the output points that are controlled by the RBC after

remote I/O channel communication is lost (jumper selectable)

• RS-232/423 baud rate (dipswitch selectable)

• RBC station address (thumbwheel selectable on the –A model RBCs,

rotary switch selectable on the –B model RBCs)

When I/O channel communication to a base is lost, the state of the outputs

is determined by the selection made on the RBC jumper JP6 (Off/Freeze).

See Figure 5-4 for the location of the Off/Freeze jumper on the –A models

and Figure 5-5 for the –B models.

For discrete output modules, the state of the outputs is determined solely by

the position of the JP6 (Off/Freeze) jumper.

For analog/word output modules, the state of the outputs is influenced not

only by the position of the Off/Freeze jumper but by the output module’s

Zero/Hold Last Value selection, if the module has that option. See Table 5-1.

Table 5-1 Analog/Word Output States

RBC Off/Freeze Selection

Analog/Word Module

Zero/Hold Selection

Analog/Word

Output State

Off Zero Zero *

Off Hold Last Value Last Value

Off – no selection – Last Value

Freeze Zero Last Value

Freeze Hold Last Value Last Value

Freeze – no selection – Last Value

*See the user manual of your analog/word output module for further details.

Notice that the Freeze option on the RBC overrides the Zero selection on the

analog/word output module; likewise, when Hold Last Value is selected on

the analog/word output module, that selection overrides the Off option on

the RBC jumper.

NOTE: If the RBC hardware watchdog timer is activated (an RBC failure),

the state of the outputs is determined by the output module, with no

reference to the RBC’s JP6 (Off/Freeze) jumper. Discrete outputs go off (to a

value of zero). Analog/word outputs obey their own Zero/Hold Last Value

selection. If no Zero/Hold Last Value selection is available on the module,

the analog/word outputs hold their last value.

User Options

Output State

Selection

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